improved asynctask based location receiver

src/LocationReceiver2.scala

@@ -0,0 +1,45 @@
+package org.aprsdroid.app
+
+import _root_.android.content.{BroadcastReceiver, Context, Intent, IntentFilter}
+import _root_.android.os.Handler
+import _root_.android.util.Log
+
+
+class LocationReceiver2[Result](bg_task : (Intent) => Result,
+				finish_task : (Result) => Unit,
+				cancel_task : (Result) => Unit)
+		extends BroadcastReceiver {
+
+	var pending = 0
+
+	def startTask(i : Intent) {
+		pending += 1
+		if (pending == 1)
+			new LRAsync(i).execute(null)
+	}
+
+	override def onReceive(ctx : Context, i : Intent) {
+		startTask(i)
+	}
+
+	class LRAsync(val i : Intent) extends MyAsyncTask[Unit, Result] {
+		override def doInBackground1(params : Array[String]) = {
+			val r = bg_task(i)
+			// here we cheat and call cancel from the bg thread, not from UI
+			if (isCancelled())
+				cancel_task(r)
+			r
+		}
+
+		override def onPostExecute(result : Result) {
+			finish_task(result)
+			if (pending > 1) {
+				// something happened, we need to rerun
+				Log.d("LocationReceiver2", "rerunning...")
+				pending = 0
+				startTask(i)
+			} else
+				pending = 0
+		}
+	}
+}